Abstract
Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), lodgepole pine (Pinuscontorta Dougl.), and white spruce (Piceaglauca (Moench) Voss) seedlings, each represented by two seed lots, were grown in Styroblock containers in a greenhouse and plastic shelter house from February 1989 to January 1990. The seedlings were exposed to two nitrogen (N) treatments and three potassium (K) treatments arranged factorially within three drought treatments. After winter storage, seedlings from a complete set of treatments were planted into hygric, mesic, and xeric sand beds during 12–14 March. Increasing nursery drought stress increased survival of Douglas-fir and lodgepole pine after planting, and high N treatment level increased survival of lodgepole pine and white spruce. Under xeric conditions, combined nursery drought and high N treatments increased survival of lodgepole pine by 33%, indicating the importance of nursery cultural regime for stock quality. Increase in nursery drought decreased seedling size relatively little, but increase in N increased seedling size one season after planting. A positive relationship between shoot/root ratio and survival in lodgepole pine and white spruce indicated that increase in N increased both shoot growth and drought resistance over the N range investigated. Only Douglas-fir showed an interaction between drought and N treatment and a small response in both survival and dry weight to K. Root growth capacity, measured at the time of planting, showed an approximate doubling in all species due to high N treatment, and was also increased in white spruce by drought stress. Survival and root growth capacity were poorly correlated, but dry-weight growth in sand beds was well correlated with root growth capacity. Shoot dry weight and percent N in shoots measured after nursery growth were correlated with root growth capacity. Manipulation of root growth capacity by changing nursery treatment was apparently possible without altering resistance to drought stress after planting.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 17
Claim · model-written summary
Increasing nursery drought increased Douglas-fir survival after planting.
- Taxon
- Douglas-fir
Pseudotsuga menziesiie0 - Treatment
- Increasing nursery drought stresse0
- Outcome
- survivale0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing nursery drought stress increased survival of Douglas-fir and lodgepole pine after planting”
Claim · model-written summary
Increasing nursery drought increased lodgepole pine survival after planting.
- Taxon
- lodgepole pine
Pinus contortae0 - Treatment
- Increasing nursery drought stresse0
- Outcome
- survivale0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing nursery drought stress increased survival of Douglas-fir and lodgepole pine after planting”
Claim · model-written summary
High nitrogen increased lodgepole pine survival.
- Taxon
- lodgepole pinePinus contortae0
- Treatment
- high N treatment levele0
- Outcome
- survivale0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high N treatment level increased survival of lodgepole pine and white spruce”
Claim · model-written summary
High nitrogen increased white spruce survival.
- Taxon
- white spruce
Picea glaucae0 - Treatment
- high N treatment levele0
- Outcome
- survivale0
- Direction
- increasede0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high N treatment level increased survival of lodgepole pine and white spruce”
Claim · model-written summary
Combined nursery drought and high nitrogen increased lodgepole pine survival by 33% under xeric conditions.
- Taxon
- lodgepole pinePinus contortae0
- Treatment
- combined nursery drought and high N treatmentse0
- Outcome
- survivale0
- Direction
- increasede0
- Value
- 33%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under xeric conditions, combined nursery drought and high N treatments increased survival of lodgepole pine by 33%”
Claim · model-written summary
Increased nursery drought decreased seedling size relatively little.
Not reportedTaxonComparatorValue
Verbatim
e0“Increase in nursery drought decreased seedling size relatively little”
Claim · model-written summary
Increased nitrogen increased seedling size one season after planting.
Not reportedTaxonComparatorValue
Verbatim
e0“increase in N increased seedling size one season after planting”
Claim · model-written summary
Shoot/root ratio related positively to survival in lodgepole pine.
- Taxon
- lodgepole pinePinus contortae0
- Organ / stage
- shoot/root ratioe0
- Outcome
- survivale0
- Direction
- positivee0
Not reportedTreatmentComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive relationship between shoot/root ratio and survival in lodgepole pine and white spruce”
Claim · model-written summary
Shoot/root ratio related positively to survival in white spruce.
- Taxon
- white sprucePicea glaucae0
- Organ / stage
- shoot/root ratioe0
- Outcome
- survivale0
- Direction
- positivee0
Not reportedTreatmentComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive relationship between shoot/root ratio and survival in lodgepole pine and white spruce”
Claim · model-written summary
Only Douglas-fir showed a drought by nitrogen interaction.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Outcome
- interaction between drought and N treatmente0
Not reportedTreatmentComparatorDirectionValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only Douglas-fir showed an interaction between drought and N treatment”
Claim · model-written summary
Douglas-fir had a small survival response to potassium.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- Ke0
- Outcome
- survivale0
- Direction
- small responsee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only Douglas-fir showed an interaction between drought and N treatment and a small response in both survival and dry weight to K”
Claim · model-written summary
Douglas-fir had a small dry-weight response to potassium.
- Taxon
- Douglas-firPseudotsuga menziesiie0
- Treatment
- Ke0
- Outcome
- dry weighte0
- Direction
- small responsee0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only Douglas-fir showed an interaction between drought and N treatment and a small response in both survival and dry weight to K”
Claim · model-written summary
High nitrogen approximately doubled root growth capacity in all three species.
Not reportedComparatorValue
Verbatim
e0“Root growth capacity, measured at the time of planting, showed an approximate doubling in all species due to high N treatment”
Claim · model-written summary
Drought stress increased white spruce root growth capacity.
- Taxon
- white sprucePicea glaucae0
- Treatment
- drought stresse0
- Direction
- increasede0
Not reportedComparatorOutcomeValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“was also increased in white spruce by drought stress”
Claim · model-written summary
Survival and root growth capacity were poorly correlated.
- Organ / stage
- root growth capacitye0
- Outcome
- Survival and root growth capacitye0
- Direction
- poorly correlatede0
Not reportedTaxonTreatmentComparatorValue
Verbatim
e0“Survival and root growth capacity were poorly correlated”
Claim · model-written summary
Dry-weight growth in sand beds correlated well with root growth capacity.
Not reportedTaxonTreatmentComparatorValue
Verbatim
e0“dry-weight growth in sand beds was well correlated with root growth capacity”
Claim · model-written summary
Shoot dry weight and shoot nitrogen percentage correlated with root growth capacity.
Not reportedTaxonTreatmentComparatorValue
Verbatim
e0“Shoot dry weight and percent N in shoots measured after nursery growth were correlated with root growth capacity”
The same questions in other papers
nitrogen · survival · Pinus contorta (lodgepole pine)Positive and negative results
1 in the opposite direction
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.